noun

1. an act or instance of interfering
2. something that interferes
3. ☆
   1. Football the legal blocking of opposing players in order to clear the way for the ball carrier; also, the player or players who do such blocking
   2. Sports the illegal hindering of an opposing player, specif., in football, of an opponent who is trying to catch a pass
4. Physics the mutual action of two waves of the same frequency, as of sound, light, etc., in reinforcing or neutralizing each other according to their relative phases on meeting
5. Radio, TV, etc.
   1. static, unwanted signals, etc., producing a distortion as of sounds or images and preventing good reception
   2. such distorted reception